21
In brazing process, the liquid metal fills the gap by which one of the following means?
A)
Capillary infiltration
B)
Gravity infiltration
C)
Pressure infiltration
D)
Vacuum infiltration
Answer & Solution
Answer: Option
A
22
Match the following:
Process Characteristics
P. Ultarasonic welding
1. Most commonly used process
Q. Plasma arc welding
2. Use of explosives
R. Thermit welding
3. Highest temperature
S. Shielded metal arc welding
4. Solid state process
5. Use of chemical energy
A)
P-4, Q-3, R-5, S-1
B)
P-2, Q-4, R-5, S-1
C)
P-1, Q-2, R-4, S-3
D)
P-3, Q-5, R-2, S-4
Answer & Solution
Answer: Option
A
23
Which of the following is not a solid state metal joining technique?
A)
Ultrasonic welding
B)
Friction welding
C)
Diffusion bonding
D)
Electroslag welding
Answer & Solution
Answer: Option
D
24
Match the following:
Group 1 Group 2
P. Thermit welding
1. Globular metal transfer
Q. Arc welding
2. Mechanical energy converted to heat energy
R. Welding in solid state
3. Exothermic process
S. Friction welding
4. Diffusion bonding
A)
P-3, Q-1, R-4, S-2
B)
P-3, Q-2, R-4, S-1
C)
P-2, Q-1, R-3, S-4
D)
P-1, Q-2, R-3, S-4
Answer & Solution
Answer: Option
A
25
Which one of the following carbon equivalent in steel is considered good for weldability?
A)
1.0
B)
0.8
C)
0.6
D)
0.4
Answer & Solution
Answer: Option
D
26
Match the welding processes in
Group 1 with the principal mechanism in
Group 2 .
Group 1 Group 2
P. Seam welding
1. Ionisation and plasma
Q. Explosive welding
2. Exothermic reaction
R. Gas welding
3. Interfacial deformation
S. TIG welding
4. Interfacial resistance heating
5. Interfacial diffusion of atoms
A)
P-5, Q-3, R-1, S-4
B)
P-5, Q-3, R-2, S-1
C)
P-4, Q-3, R-2, S-1
D)
P-5, Q-2, R-1, S-4
Answer & Solution
Answer: Option
C
27
Brazing fillermetal used for joining steel plates
A)
melts below the melting point of base metals
B)
melts below 300°C
C)
is copper-phosphorous alloy
D)
is copper
Answer & Solution
Answer: Option
A
28
Melting rate of electrodes in manual metal arc welding (MMAW) process is mainly governed by the
A)
welding current
B)
arc voltage
C)
type of coating
D)
length of the electrode
Answer & Solution
Answer: Option
C
29
Thermit welding uses the following energy sources.
A)
electrical energy
B)
chemical energy
C)
energy of high velocity electrons
D)
heat generated by friction
Answer & Solution
Answer: Option
B
30
The grain size in the heat affected zone (HAZ) of a weld is maximum
A)
near the weld metal/HAZ interface
B)
near the base metal/HAZ interface
C)
in the middle of HAZ
D)
at a location $${\frac{1}{3}^{{\text{rd}}}}$$ away from the weld/HAZ interface
Answer & Solution
Answer: Option
C
